To disable fast shutdown, follow these steps: 1. Click Start, point to Programs, point to Accessories, point to System Tools, and then click System Information.
2. On the Tools menu, click System Configuration Utility.
3. On the General tab, click Advanced.
4. Click to select the Disable Fast Shutdown check box, click OK, and then click OK.
5. Click Yes when you are prompted to restart your computer.

Realblackstuff: thanks for yr intention and I am sorry for no specify the OS: win 98Se.
Abu Khaled: the problem was fixed i followed yr instruction and now the pc switch off normally.
Thanks again to both
mloo55
:hotbounce